Table 48: Upstream Rf Channel Transmission Characteristics - Juniper G10 CMTS Hardware Manual

Table 48: Upstream RF Channel Transmission Characteristics

Parameter
Frequency range
Transit delay from the most distant CM to the nearest
CM or CMTS
Carrier-to-noise ratio
Carrier-to-ingress power (the sum of discrete and
broadband ingress signals) ratio
Carrier- to-interference (the sum of noise, distortion, common-path
distortion and cross-modulation) ratio
Carrier hum modulation
Burst noise
Amplitude ripple
Group delay ripple
Micro-reflections -- single echo
Seasonal and diurnal signal level variation
1. Transmission is from the CM output at the customer location to the headend.
2. Ingress avoidance or tolerance techniques MAY be used to ensure operation in the presence of time-varying discrete ingress signals that
could be as high as 0 dBc [CableLabs1].
3. Amplitude and frequency characteristics sufficiently strong to partially or wholly mask the data carrier.
4. CableLabs report containing distribution of return-path burst noise measurements and measurement method is forthcoming.
5. Impulse noise levels more prevalent at lower frequencies (< 15 MHz).
Value
5 to 42 MHz edge to edge
<= 0.800 msec (typically much less)
Not less than 25 dB
2
Not less than 25 dB
Not less than 25 dB
Not greater than -23 dBc (7.0%)
Not longer than 10 msec at a 1 kHz average rate for most cases
5-42 MHz: 0.5 dB/MHz
5-42 MHz: 200 ns/MHz
-10 dBc @ <= 0.5 m sec
-20 dBc @ <= 1.0 m sec
-30 dBc @ > 1.0 m sec
Not greater than 8 dB min to max
Radio Frequency (RF) Specifications
3,4,5
Radio Frequency (RF) Specifications
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